Mini Itx PSU died

Hello :O)

Just sold a friend and mini-itx computer that comes with a generic 150W power supply, and it seems like the PSU died.
Now..The thing is that it worked at my place for about 6 months without any problem with E6300 and E2140 cpu (it's motherboard is Intel G41 based), And when I sold it last week I've installed E6600 (3.06Ghz) Cpu with Aluminum based intel heatsink and fan and 4GB of ddr2 memory. Tempratures were fine during my checks.
Is it possible that 150W is not enough for this combo ? Or because it was a generic non-brand PSU ? The cpu consumption is about 65W and the memories and drive I guess don't consume more than 50W....So i'm a bit puzzled. I thought about buying HEC REAL 150W PSU just to be on the safe side....

Update : I've decided to go on a real 200W PSU, Just to be on the safe side :

http://www.hec-group.com.tw/power_supply/flex_atx12v/

I will need to find a place inside this small case to fit the PSU, But it seems possible from the measures I've made (The original PSU is 150x65x65mm and the HEC strongest PSU is 82x150x43 so there will be enough space to shove it in a safe way), And I hope 200W is giving enough "breath space" for the stronger cpu and added ram.